Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ASTM D226 TY1 found under Roofing Felt by American Society For Testing And. The National Stock Number assigned to this part is 5650001714706, and the Federal Supply Class is 5650 Roofing And Siding Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like ASTM D226 TY1.